Seoul's chief nuclear negotiator Cho Tae-yong on Sunday told reporters that South Korea will approach negotiations about the North Korean atomic program “in a more proactive manner."
Cho is in the U.S. to meet his American and Japanese counterparts with a view to discussing stalled six-party talks with North Korea.
Cho said the Park Geun-hye administration wants South Korea to play a "more central role" among the other parties.
The U.S. is currently minded merely to contain the North Korean nuclear crisis rather than trying to achieve denuclearization, and Seoul fears Washington has relegated the issue to second place after the Middle East.
Meanwhile, China's top nuclear envoy Wu Dawei, who was in Washington a week before Cho, arrived in Pyongyang on Monday, the North's official KCNA news agency reported. It did not mention the purpose of Wu's visit, but he is apparently there to meet with his North Korean counterpart Kim Kye-gwan.
China and North Korea are keener than the U.S. and South Korea on restarting the six-party talks immediately.